" An investigation by the U.S. Army’s Combat Studies Institute found that the Waygal elders might have deliberately drawn out a meeting that had been called to discuss the site for the new American outpost, keeping the officers from 173rd Airborne talking long enough for an ambush to get into place to attack the Americans as they left.10 The same study found that the local community, for historical, ethnic and economic reasons, had a strong incentive to stop the U.S. Army building a road into their valley—a traditional buffer zone between two antagonistic local population groups, Nuristanis and Safi Pashtuns, who competed politically and economically and had a long history of violent conflict.11 "

― David Kilcullen , Out of the Mountains: The Coming Age of the Urban Guerrilla